If the pressure in a closed vessel is reduced by drawing out some gas, the mean free path of the molecules:

1. decreases
2. increases
3. remains unchanged
4. increases or decreases according to the nature of the gas

Subtopic:  Mean Free Path |
 74%
From NCERT
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At constant volume, temperature is increased. Then

1. Collision on walls will be less

2. Number of collisions per unit time will increase

3. Collisions will be in straight lines

4. Collisions will not change

Subtopic:  Types of Velocities |
 93%
From NCERT
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The r.m.s. speed of a certain gas is n at 400K. The temperature at which the r.m.s. speed becomes two times, will be

1.  800 K                         

2.  1600 K

3.  1200 K                       

3.  None of these

Subtopic:  Types of Velocities |
 86%
From NCERT
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A cubical box with porous walls containing an equal number of O2 and H2 molecules is placed in a large evacuated chamber. The entire system is maintained at constant temperature T. The ratio of vrms of O2 molecules to that of the vrms of H2 molecules, found in the chamber outside the box after a short interval is

1.  122                             

2.  14

3.  12                               

4.  2

Subtopic:  Types of Velocities |
 83%
From NCERT
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The degrees of freedom of a triatomic gas is

1.  2                                 

2.  4

3.  6                                 

3.  8

Subtopic:  Law of Equipartition of Energy |
 88%
From NCERT
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The value of CV for one mole of neon gas is

1.  12R                           

2.  32R

3.  52R                           

4.  72R

Subtopic:  Specific Heat |
 87%
From NCERT
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At constant volume, for different diatomic gases the molar specific heat is

1. Same and 3 cal/mole/°C approximately

2. Exactly equal and its value is 4 cal/mole/°C

3. Will be totally different

4. Approximately equal and its value is 5 cal/mole/°C

Subtopic:  Specific Heat |
 60%
From NCERT
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At constant volume the specific heat of a gas is 3R2 , then the value of 'γ' will be

1.  32                             

2.  52

3.  53                             

4.  None of the above

Subtopic:  Specific Heat |
 83%
From NCERT
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The relation between two specific heats (in cal/mol) of a gas is-

1.  CP-CV=RJ                               

2.  CV-CP=RJ

3.  CP-CV=J                                 

4.  CV-CP=J

Subtopic:  Specific Heat |
 88%
From NCERT
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The specific heat of an ideal gas is:

1.  proportional to T.                     

2.  proportional to T2.

3.  proportional to T3.                  

4.  independent of T.

Subtopic:  Specific Heat |
 63%
From NCERT
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